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托福考试: 托福语法与结构测试题3

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Determine whether the underlined portion of the sentence below is correct or whether it needs to be revised.

Concerns about global warming have grown into actual efforts sanctioned by non-governmental organizations and governments that not only work to understand global warming and also to prevent it.

A)understand global warming and also to prevent it.

B)understand global warming but also to prevent it.

C)understand global warming yet also to prevent it.

D)understand global warming but also to prevent its growth.

E)understand global warming yet also to prevent its growth.

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